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The minimum cracking pressure is the lowest differential pressure that is allowable in your system.
Lohms represent resistance in a fluid system.
Lohm is a measure of resistance to flow. The higher the Lohm rate, the more restrictive the flow. The maximum Lohm rating of the part is your flow criteria for the part.
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16 Products Found
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281 NACE Compliant PRI® Pressure Relief Valve
This miniature pressure relief valve is constructed entirely of corrosion-resistant materials and is compliant with NACE specification MR0175/ISO 15156.
Key Product Facts
  • NACE Compliant Safety Relief Valve
  • Diameter: 0.281 inches
  • Full Open Lohm Rate: 350 Lohms max
  • Nominal System Pressure: Up to 3000 psi
  • Cracking Pressure Range: 80 to 3600 psi
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250 High Pressure TRI Thermal Pressure Relief Valve
This relief valve has been optimized to relieve small flows caused by thermal expansion of a trapped volume of fluid in high pressure systems.
Key Product Facts
  • High Pressure Thermal Relief Valve
  • Diameter: 0.250 inches
  • Full Open Lohm Rate: 136,000 Lohms max
  • Nominal System Pressure: Up to 5000 psi
  • Cracking Pressure Range: 3500 to 5800 psi
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187 Zero-Leak PRI® Pressure Relief Valve
This miniature, fast-acting safety relief valve is ideal for low pressure applications where leakage is critical.
Key Product Facts
  • Zero Leak Relief Valve
  • Diameter: 0.187 inches
  • Full Open Lohm Rate: 750 Lohms max
  • Nominal System Pressure: Up to 3000 psi
  • Cracking Pressure Range: 20 to 100 psi
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281 High Pressure PRI® Relief Valve
This miniature, high pressure safety relief valve is ideal for systems up to 5000 psi. It is available with a wide variety of cracking pressures.
Key Product Facts
  • High Pressure Relief Valve
  • Diameter: 0.281 inches
  • Full Open Lohm Rate: 1500 Lohms max
  • Nominal System Pressure: Up to 5000 psi
  • Cracking Pressure Range: 3000 to 5900 psi
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281 Zero-Leak PRI® Pressure Relief Valve
This miniature, fast-acting safety relief valve is ideal for hydraulic applications where leakage is critical.
Key Product Facts
  • Zero Leak Thermal Relief Valve
  • Diameter: 0.281 inches
  • Full Open Lohm Rate: 100,000 Lohms max
  • Nominal System Pressure: Up to 4000 psi
  • Cracking Pressure Range: 800 to 4700 psi
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375 HD PRI® High Stability Pressure Relief Valve
This direct-acting valve is designed to provide an extremely stable relief flow over various flow rates and pressure combinations.
Key Product Facts
  • Safety Relief Valve
  • Diameter: 0.375 inches
  • Full Open Lohm Rate: 400 Lohms max
  • Nominal System Pressure: Up to 5000 psi
  • Cracking Pressure Range: 3000 to 5400 psi
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500 Momentum PRI® Pressure Relief Valve
This miniature valve is ideally suited for hydraulic applications where a relief valve with higher flow is needed to regulate the upstream pressure.
Key Product Facts
  • Safety Relief Valve
  • Diameter: 0.500 inches
  • Full Open Lohm Rate: 50 Lohms max
  • Nominal System Pressure: Up to 3000 psi
  • Cracking Pressure Range: 50 to 500 psi
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687 Side Exit Pressure Relief Valve
This fast-acting safety relief valve is ideal for systems up to 3000 psi where a Line Removable Unit (LRU) is desirable.
Key Product Facts
  • Safety Relief Valve
  • Diameter: 0.687 inches
  • Full Open Lohm Rate: 350 Lohms max
  • Nominal System Pressure: Up to 3000 psi
  • Cracking Pressure Range: 400 to 3600 psi
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HI-Q Side Exit Pressure Relief Valve
This fast-acting safety relief valve is ideal for systems up to 5000 psi where a Line Replaceable Unit (LRU) is desirable.
Key Product Facts
  • High Flow Relief Valve
  • Diameter: 1 inch
  • Full Open Lohm Rate: 100 Lohms max.
  • Nominal System Pressure: Up to 5000 psi
  • Cracking Pressure Range: 1000 to 5400 psi
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187 PRI® Pressure Relief Valve
This miniature, fast-acting safety relief valve is ideal for low pressure applications.
Key Product Facts
  • Safety Relief Valve
  • Diameter: 0.187 inches
  • Full Open Lohm Rate: 400 Lohms max.
  • Nominal System Pressure: Up to 3000 psi
  • Cracking Pressure Range: 20 to 100 psi
View Product
187 TRI Thermal Pressure Relief Valve
This high pressure relief valve has been optimized to relieve small flows caused by thermal expansion of a trapped volume of fluid.
Key Product Facts
  • Thermal Relief Valve
  • Diameter: 0.187 inches
  • Full Open Lohm Rate: 325,000 Lohms max
  • Nominal System Pressure: Up to 4000 psi
  • Cracking Pressure Range: 3500 to 4700 psi
View Product
375 High Pressure PRI® Relief Valve
This miniature, high pressure safety relief valve is ideal for systems up to 5000 psi where more flow is needed. It is available with a wide variety of cracking pressures.
Key Product Facts
  • High Pressure Relief Valve
  • Diameter: 0.375 inches
  • Full Open Lohm Rate: 400 Lohms max
  • Nominal System Pressure: Up to 5000 psi
  • Cracking Pressure Range: 3000 to 5400 psi
View Product
250 PRI® Pressure Relief Valve
This miniature, fast-acting safety relief valve is ideal for low flow (less than 0.31 GPM) hydraulic applications with systems up to 3000 psi. It is available in a wide variety of cracking pressures.
Key Product Facts
  • Safety Relief Valve
  • Diameter: 0.250 inches
  • Full Open Lohm Rate: 4500 Lohms max
  • Nominal System Pressure: Up to 3000 psi
  • Cracking Pressure Range: 80 to 3600 psi
View Product
281 PRI® Pressure Relief Valve
This miniature, fast-acting safety relief valve is ideal for systems up to 3000 psi and is available with a wide variety of cracking pressures.
Key Product Facts
  • Safety Relief Valve
  • Diameter: 0.281 inches
  • Full Open Lohm Rate: 350 Lohms max
  • Nominal System Pressure: Up to 3000 psi
  • Cracking Pressure Range: 80 to 3600 psi
View Product
375 Momentum PRI® Pressure Relief Valve
This miniature valve is ideally suited for hydraulic applications where a relief valve is needed to regulate the upstream pressure.
Key Product Facts
  • Safety Relief Valve
  • Diameter: 0.375 inches
  • Full Open Lohm Rate: 100 Lohms max
  • Nominal System Pressure: Up to 3000 psi
  • Cracking Pressure Range: 50 to 500 psi
View Product
281 NACE Compliant High Pressure PRI® Relief Valve
This high pressure, miniature pressure relief valve is constructed entirely of corrosion-resistant materials and is compliant with NACE specification MR0175/ISO 15156.
Key Product Facts
  • NACE Compliant High Pressure Relief Valve
  • Diameter: 0.281 inches
  • Full Open Lohm Rate: 1500 Lohms max
  • Nominal System Pressure: Up to 5000 psi
  • Cracking Pressure Range: 3000 to 5900 psi
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